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173. Holden, P. B., and C. B. Stalnaker. 1970. SURVEY <br />Systematic studies of cyprinid genus Gila DESCRIPTION <br />in the upper Colorado River basin. Copeia TAXONOMY <br />.3:409-420. (Abstr.) DISTRIBUTION <br /> ENDANG. FISH <br />Three hundred and nine specimens of Gila from SPAWNING <br />the Colorado River basin were studied by taxi- ECOLOGY <br />metric analysis. Results of the study indicate COLORADO R. <br />that the concept of ecosubspecies or ecological 1, 2 <br />subspecies does not fit Colorado basin Gila. <br />The roundtail and bonytail chubs, G. robusta <br />Baird and Girard and G. elegans Baird and <br />Girard respectively, currently treated as <br />subspecies, are well separated morphologically, <br />ecologically, and apparently reproductively <br />and, therefore, are better considered two <br />species. The relationship between G. cypha <br />Miller,-the humpback chub, and G. elegans is <br />clouded by the presence of intergrade forms. <br />Futher investigations are needed to resolve <br />this problem. Insufficient material was avail- <br />able to make any conclusions on taxonomic <br />status of the Virgin River population. However, <br />the subspecies name seminuda (Cope and Yarrow) <br />should be restricted to Gila of Virgin River. <br />174. Holden, P. B., and C. B. Stalnaker. 1971. ENDANG. FISH <br />Progress report on rare and endangered DISTRIBUTION <br />fish species in the upper Colorado River DOLORES R. <br />basin. Utah Cooperative Fishery Unit, YAMPA R. <br />Utah State University, Logan. 14 pp. 4, 5 <br />This report is concerned with two stream systems, <br />the Dolores and Yampa River, and the fish <br />distribution, with emphasis on-the rare and <br />endangered species. From the standpoint of <br />rare and endangered species, the Dolores River <br />system appears to have little importance. Its <br />importance to native fishes lies primarily in <br />its capacity to provide the main Colorado River <br />with water flows that maintain a natural large <br />river environment. It is not providing such <br />flow now, and can be considered neutral, even <br />detrimental to preservation of native fishes. <br />On the other hand, the Yampa River is very <br />important in the preservation of "large river" <br />fishes primarily because all rare and endangered <br />Colorado basin fishes are present in small <br />numbers. <br />74 <br />